在开发小程序时，新版3.5.3中报length未定义，在3.4.7老版本是OK的

分类：HBuilderX

VM2075:5156 页面【components/uni-file-picker/uni-file-picker]错误:
TypeError: Cannot read property 'length' of undefined
at vendor.js?t=wechat&s=1661393551974&v=72be0d78b2504e5344336e5160db4d8b:20169
at Object.<anonymous> (vendor.js?t=wechat&s=1661393551974&v=72be0d78b2504e5344336e5160db4d8b:20169)
at Object.672 (vendor.js?t=wechat&s=1661393551974&v=72be0d78b2504e5344336e5160db4d8b:20170)
at webpack_require_ (runtime.js? [sm]:92)
at Object. (uni-file-picker.js? [sm]:712)
at webpack_require (runtime.js? [sm]:92)
at Module._ (uni-file-picker.js? [sm]:102)
at __webpack_require (runtime.js? [sm]:92)
at Module._ (uni-file-picker.js? [sm]:13)
at __webpack_require__ (runtime.js? [sm]:92)(env: Windows,mp,1.06.2208010; lib: 2.22.0)